Configuring Token Ring Route Switch Module

This chapter describes how to configure Token Ring virtual LANs (VLANs) on the route switch module (RSM). For a complete description of the commands mentioned in this chapter, refer to the Cisco IOS Bridging and IBM Networking Command Reference (Volume 1 of 2). To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.

The Token Ring RSM feature is supported on the RSM in the Catalyst 5000 platform. Support for the Token Ring RSM feature was first introduced in the Cisco IOS Release 11.3(5)T. The Token Ring RSM feature is supported on all RSM Cisco IOS Release 12.0 T images. A list of the supported Cisco IOS releases and software images are located in the Release Notes for Catalyst 5000 Family RSM/VIP2 Cisco IOS 12.0 T Software Releases publication. A complete description of the RSM can be found in the Catalyst 5000 Family Route Switch Module Installation and Configuration Note and the Route Switch Module Catalyst VIP2-15 and VIP2-40 Installation and Configuration Note.

The Token Ring VLAN support on the RSM adds the capability to do multiprotocol routing and bridging for Token Ring VLANs on the RSM. The RSM is a router module running Cisco IOS software that plugs into a switch that supports Token Ring. This section provides a brief overview of Token Ring switching.

To identify the hardware platform or software image information associated with a feature, use the Feature Navigator on Cisco.com to search for information about the feature or refer to the software release notes for a specific release. For more information, see the "Identifying Platform Support for Cisco IOS Software Features" section on page li in the "Using Cisco IOS Software" chapter.

Technology Overview

The term switching was originally used to describe packet-switch technologies such as Link Access Procedure, Balanced (LAPB), Frame Relay, Switched Multimegabit Data Service (SMDS), and X.25. Today, LAN switching refers to a technology that is similar to a bridge in many ways.

Like bridges, switches connect LAN segments and use information contained in the frame to determine the segment to which a datagram needs to be sent. Switches, however, operate at much higher speeds than bridges, and can support new functionality, such as VLANs. See the "VLAN" section and the "Token Ring VLANs" section.

Token Ring switches first appeared in 1994. The first-generation Token Ring switches can be divided into two basic categories:

•Processor-based switches—These switches use reduced instruction set computer (RISC) processors to switch Token Ring frames. Although they typically have a lot of function, they are slow and relatively expensive. These switches have been deployed mainly as backbone switches because of their high cost.

•Application-specific integrated circuit (ASIC)-based switches with limited functionality—These switches are fast and relatively inexpensive, but have very limited function. Typically, they offer little to no filtering, limited management information, limited support for bridging modes, and limited VLANs. Today, although these switches are less expensive than processor-based switches, they are still too expensive and limited for widespread use of dedicated Token Ring to the desktop.

In 1997, a second generation of Token Ring switches was introduced. Cisco's second-generation Token Ring switches use ASIC-based switching, but they provide increased functionality resulting in a higher speed and lower cost. They also provide a wider variety of function than their predecessors, including support for multiple bridging modes, Dedicated Token Ring (DTR) on all ports, high-port density, high-speed links, filtering, Remote Monitoring (RMON) management, broadcast control, and flexible VLANs.

The family of second-generation Token Ring switches can be used for backbone switching, workgroup microsegmentation, and dedicated Token Ring to the desktop. Switches currently being offered that support Token Ring include:

•The Catalyst 3900, which is a stackable workgroup Token Ring switch that provides support for all switching modes, filtering, RMON, DTR, and SNMP management, and support for Asynchronous Transmission Mode (ATM) and Inter-Switch Link (ISL).

•The Catalyst 3920, which is a also a stackable workgroup Token Ring switch that provides support for all switching modes, filtering, RMON, DTR, and SNMP management.

Usability of Switching

The traditional method of connecting multiple Token Ring segments is to use a SRB. For example, bridges are often used to link workgroup rings to the backbone ring. However, the introduction of the bridge can significantly reduce performance at the user's workstation. Further problems might be introduced by aggregate traffic loading on the backbone ring.

To maintain performance and avoid overloading the backbone ring, you can locate servers on the same ring as the workgroup that needs to access the server. However, dispersing the servers throughout the network makes them more difficult to back up, administer, and secure than if they are located on the backbone ring. Dispersing the servers also limits the number of servers that particular stations can access.

Collapsed backbone routers might offer greater throughput than bridges, and can interconnect a larger number of rings without becoming overloaded. Routers provide both bridging and routing functions between rings and have sophisticated broadcast control mechanisms. These mechanisms become increasingly important as the number of devices on the network increases.

The main drawback of using routers as the campus backbone is the relatively high price per port and the fact that the throughput typically does not increase as ports are added. A Token Ring switch is designed to provide wire speed throughput regardless of the number of ports in the switch. In addition, the Catalyst 3900 Token Ring switch can be configured to provide very low latency between Token Ring ports by using cut-through switching.

As a local collapsed backbone device, a Token Ring switch offers a lower per-port cost and can incur lower interstation latency than a router. In addition, the switch can be used to directly attach large numbers of clients or servers, thereby replacing concentrators. Typically, a Token Ring switch is used in conjunction with a router, providing a high-capacity interconnection between Token Ring segments while retaining the broadcast control and wide-area connectivity provided by the router.

VLAN

A VLAN is a logical group of LAN segments, independent of physical location, with a common set of requirements. For example, several end stations might be grouped as a department, such as engineering or accounting. If the end stations are located close to one another, they can be grouped into a LAN segment. If any of the end stations are on a different LAN segment, such as different buildings or locations, they can be grouped into a VLAN that has the same attributes as a LAN even though the end stations are not all on the same physical segment. The information identifying a packet as part of a specific VLAN is preserved across a Catalyst switch connection to a router or another switch if they are connected via trunk ports, such as ISL or ATM.

Token Ring VLANs

Because a VLAN is essentially a broadcast domain, a Token Ring VLAN is slightly more complex than an Ethernet VLAN. In transparent bridging, there is only one type of broadcast frame and, therefore, only one level of broadcast domain and one level of VLAN. In source routing, however, there are two types of broadcast frames:

•Those that are confined to a single ring

•Those that traverse the bridged domain

Therefore, there are two levels of VLANs in a Token Ring switched network. These two categories of broadcast frames result in a broadcast domain that is hierarchical in nature, just as a local ring domain can exist only within a domain of all the inter-connected rings.

The first level is the Token Ring Concentrator Relay Function (TrCRF). In a Token Ring VLAN, logical ring domains are formed by defining groups of ports that have the same ring number. The IEEE calls such a port group a Concentrator Relay Function (CRF). On Catalyst switches, such a grouping of Token Ring ports is called a Token Ring CRF (TrCRF). At this level, the VLAN is a logical ring and, as such, is assigned a ring number. On a Token Ring switch, the logical ring (TrCRF) contains one or more physical ports. Source-route switching is used to forward frames within a TrCRF based on Media Access Control (MAC) address or Route Descriptor. On an RSM, a logical ring (TrCRF) can be defined that does not contain any physical ports, but rather is used only in processing source-routed traffic to terminate the RIF.

The second level of VLAN is the Token Ring Bridge Relay Function (TrBRF). This is the parent VLAN to which TrCRF VLANs are assigned. The domain of interconnected rings is formed using an internal multiport bridge function that the IEEE calls a Bridge Relay Function (BRF). On Catalyst switches, such a grouping of logical rings is called a Token Ring BRF (TrBRF). At this level, the VLAN is a logical bridge and, as such, is assigned a bridge number. The TrBRF is responsible for forwarding frames between groups of ports with the same ring number (TrCRFs) via either SRB or SRT.

Token Ring VLAN Support on the RSM

The Token Ring VLAN support on the RSM adds the capability to do multi-protocol routing and bridging for Token Ring VLANs on the RSM. The RSM can be used alone to do inter-VLAN routing, or it can be paired with a Catalyst second-generation Versatile Interface Processor (VIP2) to provide external network connections with the same port adapters used on Cisco 7500 series routers. The RSM/VIP2 combination provides routing between VLANs and Catalyst VIP2 port adapters.

The Token Ring VLAN support on the RSM adds the following functionality to the Catalyst 5000 switch:

The RSM is a router module running Cisco IOS router software that directly interfaces (plugs into) the Catalyst switch backplane. From the Token Ring VLAN perspective, the interface to the RSM is at the Token Ring bridged network (TrBRF) level. With the RSM, it is possible to route or bridge between separate Token Ring and Ethernet domains.

When routing or bridging between TrBRF VLANs that are defined as SRB domains, it is necessary to create a logical ring on the RSM for proper RIF processing. This logical ring is defined as a TrCRF VLAN that does not contain any external Token Ring switch ports. Figure 2 illustrates the logical view of IP routing between two source-route bridged VLANs on the RSM. In this view, the RSM appears to have an interface to both ring 100 and ring 110.

Note For information on configuring DLSw+, refer to the "Configuring Data-Link Switching Plus" chapter in this publication and the "DLSw+ Commands" chapter in the Cisco IOS Bridging and IBM Networking Command Reference (Volume 1 of 2).

Configuring IP Routing

The IP routing for Token Ring VLANs feature extends IP routing capabilities to include support for routing IP frame types in Token Ring VLAN configurations. IP can be routed between:

•TrBRFs

•TrBRFs and the VIP2

•TrBRFs and Ethernet VLANs

To configure IP routing on an RSM, use the following commands beginning in global configuration mode:

Command

Purpose

Step 1

Router(config)# iprouting

Enables IP routing on the RSM.

Step 2

Router(config)# interface vlanvlanidtype [trbrf | ethernet]

Configures a Token Ring or Ethernet interface on the RSM.

Step 3

Router(config-if)# ip address ip-address mask

Sets a primary IP address for an interface.

You can configure an RSM to route source-routed traffic by creating a "pseudoring" to terminate the RIF path on a ring and by enabling the collection and use of RIF information.

To route source-routed traffic, use the following additional commands in interface configuration mode:

Configuring IPX Routing

The IPX routing support for Token Ring VLANs extends Novell NetWare routing capabilities to include support for routing IPX on Token Ring VLAN interfaces and on Ethernet VLAN interfaces. IPX can be routed between:

•TrBRFs

•TrBRFs and the VIP2

•TrBRFs and Ethernet VLANs

Users with Novell NetWare environments can configure either SAP or SNAP encapsulations to be routed across VLAN boundaries.

To configure Cisco IOS software to route IPX on an RSM with connected Token Ring VLANs, use the following commands beginning in global configuration mode:

Configuring Automatic Spanning Tree

The automatic spanning-tree function supports automatic resolution of spanning trees in SRB networks, which provides a single path for spanning explorer frames to traverse from a given node in the network to another. Spanning explorer frames have a single-route broadcast indicator set in the RIF. Port identifiers consist of ring numbers and bridge numbers associated with the ports. The spanning-tree algorithm for SRB does not support Topology Change Notification Bridge Protocol Data Unit (BPDU).

Although the automatic spanning-tree function can be configured with SR/TLB, the SRB domain and transparent bridging domain have separate spanning trees. Each Token Ring interface can belong to only one spanning tree. Only one bridge group can run the automatic spanning-tree function at a time.

To create a bridge group that runs an automatic spanning-tree function compatible with the IBM SRB spanning-tree implementation, use the following command in global configuration mode:

Command

Purpose

Router(config)# bridgebridge-groupprotocol ibm

Creates a bridge group that runs the automatic spanning-tree function.

To enable the automatic spanning-tree function for a specified group of bridged interfaces in SRB or SR/TLB, use the following command in interface configuration mode:

Command

Purpose

Router(config-if)# source-bridgespanning bridge-group

Enables the automatic spanning-tree function on a group of bridged interfaces.

Verifying TRRSM

To verify that Token Ring Route Switch Module (TRRSM) is configured, use the following command in privileged EXEC mode:

Command

Purpose

Router# show running configuration

Displays the running configuration of a device.

The following output indicates this is a Token Ring VLAN because of the trbrf interface:

milan# show run

version 12.0

!

hostname Sample

!

interface Vlan61 type trbrf

no ip address

no ip directed-broadcast

no ip route-cache

ethernet-transit-oui 90-compatible

To verify the status of the Token Ring VLAN, use one of the following commands in privileged EXEC mode, as needed:

Command

Purpose

Router# show ip interfaces brief

Lists a summary of an interface's IP information and status

Router# show interface

Displays statistics for all interfaces configured on the router or access server

The following output indicates that Vlan5 and Vlan61 interfaces are up:

RSM-A# show ip interface brief

Interface IP-Address OK? Method Status Protocol

Vlan5 unassigned YES unset up up

Vlan61 unassigned YES NVRAM up up

The following output shows the statistics for Vlan61:

RSM-A# show interface vlan61

Vlan61 is up, line protocol is up

Hardware is Cat5k Virtual Token Ring, address is 0009.d49e.0100 (bia

0009.d49e.0100)

MTU 4464 bytes, BW 16000 Kb, DLY 630 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation SNAP, loopback not set

ARP type:SNAP, ARP Timeout 04:00:00

Ring speed:16 Mbps

Duplex:half

Mode:Classic token ring station

Monitoring Statistics

You can collect, display, and clear statistical information about the network. The Duplicate Ring Protocol (DRiP) runs on Cisco routers and switches that support switched VLAN networking and is used to identify active Token Ring VLANs (TrCRFs). DRiP maintains the status of TrCRFs and uses this information to determine whether there are multiple TrCRFs active in a TrBRF.

DRiP information is used for the following:

•All-routes explorer filtering

DRiP information is used in conjunction with the local configuration to determine which of the TrCRFs configured within a TrBRF have active ports. This information is used on the base switch to correctly filter all-routes explorers and on the RSM to discard AREs that have already been on an attached ring.

•Detecting the configuration of duplicate TrCRFs across routers and switches

DRiP information is used in conjunction with the local configuration information to determine which TrCRFs are already active on the switches. If a TrCRF is enabled on more than one switch or router, the ports associated with the TrCRF are disabled on all switches. The RSM will not disable the internal ring used for processing source-routed traffic. Instead, the RSM generates the following error message to indicate that two identical TrCRFs exist:

DRIP conflict with CRF <vlan-id>

To show or clear DRiP or VLAN statistics, use one of the following commands in privileged EXEC mode, as needed:

Command

Purpose

Router# clear drip counters

Clears DRiP counters.

Router# show drip

Displays DRiP information.

Note When DRiP counters are cleared, the counter is reset to 0. Incrementing of DRiP counters indicates that the router is receiving packets across the TrBRF.

TRRSM Configuration Examples

The following sections provide the following RSM and Catalyst 5000 switch configuration examples:

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with the TrCRF VLAN 201:

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 998 type trbrf bridge 0xd stp ibm

set vlan 200 type trcrf parent 998 ring 0x64 mode srb

set vlan 201 type trcrf parent 998 ring 0x65 mode srb

#add token port to trcrf 201

set vlan 201 5/1

Because the VLANs are defined on a per-port basis, end stations connected to ports that belong to the same VLAN should belong to the same IP subnetwork.

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with TrCRF VLAN 201.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 998 type trbrf bridge 0xd stp ibm

set vlan 200 type trcrf parent 998 ring 0x64 mode srb

set vlan 201 type trcrf parent 998 ring 0x65 mode srb

#add token ring port to trcrf 201

set vlan 201 5/1

Because the VLANs are defined on a per-port basis, end stations connected to ports that belong to the same VLAN should belong to the same IP subnetwork.

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with TrCRF VLAN 300 and the Token Ring port 5/2 is assigned with TrCRF VLAN 301.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 998 type trbrf bridge 0xd stp ibm

set vlan 200 type trcrf parent 998 ring 0x64 mode srb

set vlan 300 type trcrf parent 998 ring 0x66 mode srb

set vlan 999 type trbrf bridge 0xe stp ibm

set vlan 201 type trcrf parent 999 ring 0x65 mode srb

set vlan 301 type trcrf parent 999 ring 0x67 mode srb

#add token port to trcrfs

set vlan 300 5/1

set vlan 301 5/2

Because the VLANs are defined on a per-port basis, end stations connected to ports that belong to the same VLAN should belong to the same IP subnetwork.

IP Routing Source-Routed Frames Between a TrBRF VLAN and an Ethernet VLAN Example

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 3 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with TrCRF VLAN 300 and the Ethernet port 3/1 is assigned with VLAN 500.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 998 type trbrf bridge 0xd stp ibm

set vlan 200 type trcrf parent 998 ring 0x64 mode srb

set vlan 300 type trcrf parent 998 ring 0x66 mode srb

#add token port to trcrf 300

set vlan 300 5/1

#add ether port to 500

set vlan 500 3/1

Because the VLANs are defined on a per-port basis, end stations connected to ports that belong to the same VLAN should belong to the same IP subnetwork.

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with the TrCRF VLAN 201.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 998 type trbrf bridge 0xd stp ieee

set vlan 201 type trcrf parent 998 ring 0x65 mode srt

#add token port to trcrf 201

set vlan 201 5/1

Because the VLANs are defined on a per-port basis, end stations connected to ports that belong to the same VLAN should belong to the same IP subnetwork.

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with TrCRF VLAN 201.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 998 type trbrf bridge 0xd stp ieee

set vlan 201 type trcrf parent 998 ring 0x65 mode srt

#add token ring port to trcrf 201

set vlan 201 5/1

Because the VLANs are defined on a per-port basis, end stations connected to ports that belong to the same VLAN should belong to the same IP subnetwork.

IP Routing Non-Source-Routed Frames Between TrBRF VLANs Example

Note The multiring command is not needed in this configuration because these are non-source-routed frames.

Figure 9 IP Routing Non-Source-Routed Frames Between TrBRF VLANs

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with VLAN 300 and the Token Ring port 5/2 is assigned with VLAN 301.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 998 type trbrf bridge 0xd stp ieee

set vlan 300 type trcrf parent 998 ring 0x66 mode srt

set vlan 999 type trbrf bridge 0xd stp ieee

set vlan 301 type trcrf parent 999 ring 0x67 mode srt

#add token port to trcrfs

set vlan 300 5/1

set vlan 301 5/2

Because the VLANs are defined on a per-port basis, end stations connected to ports that belong to the same VLAN should belong to the same IP subnetwork.

IP Routing Non-Source-Routed Frames Between a TrBRF VLAN and an Ethernet VLAN Example

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 3 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with TrCRF VLAN 300 and the Ethernet port 3/1 is assigned with VLAN 500.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 998 type trbrf bridge 0xd stp ieee

set vlan 300 type trcrf parent 998 ring 0x66 mode srt

#add token port to trcrf 300

set vlan 300 5/1

#add ether port to 500

set vlan 500 3/1

Because the VLANs are defined on a per-port basis, end stations connected to ports that belong to the same VLAN should belong to the same IP subnetwork.

Following is the configuration for the Catalyst 5000 switch which performs simple SRB. In this configuration, the Token Ring switch module exists in slot 5 and is using port 1. The Token Ring port on 5/1 is assigned to TrCRF VLAN 50.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 999 name trbrf type trbrf bridge 0xe stp ibm

set vlan 40 name trcrf40 type trcrf parent 999 ring 0x64 mode srb

set vlan 50 name trcrf50 type trcrf parent 999 ring 0x1 mode srb

#add token port to trcrf 50

set vlan 50 5/1

In this configuration, the keyword name is optional and srb is the default mode. The ring number on the switch must be specified in decimal by substituting the decring keyword for ring.

The following is the configuration for the Catalyst 5000 switch with the Token Ring switch module in slot 5. The Token Ring port on 5/1 is assigned to TrCRF VLAN 50 and the Token Ring port on 5/2 is assigned to TrCRF VLAN 80.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 999 name trbrf type trbrf bridge 0xe stp ibm

set vlan 40 name trcrf40 type trcrf parent 999 ring 0x64 mode srb

set vlan 50 name trcrf50 type trcrf parent 999 ring 0x1 mode srb

set vlan 998 name trbrf type trbrf bridge 0xd stp ibm

set vlan 70 name trcrf70 type trcrf parent 998 ring 0x64 mode srb

set vlan 80 name trcrf80 type trcrf parent 998 ring 0x2 mode srb

#add token port to trcrf 50

set vlan 50 5/1

#add token port to trcrf 80

set vlan 80 5/2

In this configuration, the keyword name is optional and srb is the default mode.

Transparent Bridging Between a TrBRF VLAN and a VIP2 Token Ring Interface Example

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 2 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port on 2/1 is assigned to VLAN 21.

The following is the configuration for the Catalyst 5000 switch with an Ethernet module in slot 3 and a Token Ring switch module in slot 5. In this configuration, the Token Ring port on 5/1 is assigned to TrCRF 21, and the Ethernet port on 3/1 is assigned to VLAN 100.

#vtp

set vtp domain trrsm

set vtp mode server

set vtp v2 enable

#drip

set tokenring reduction enable

set tokenring distrib-crf disable

#vlans

set vlan 999 type trbrf bridge 0xd stp ibm

set vlan 20 type trcrf parent 999 ring 0x64 mode srb

set vlan 21 type trcrf parent 999 ring 0x65 mode srb

#add token port to trcrf 21

set vlan 21 5/1

#add ethernet

set vlan 100 type ethernet

set vlan 100 3/1

DLSw+ Example

The following is the configuration for the RSM with a VIP2 serial interface as shown in Figure 16:

source-bridge ring-group 100

dlsw local-peer peer-id 10.18.20.8

dlsw remote-peer 0 tcp 10.18.20.6

!

interface Serial1/0

ip address 10.18.20.8 255.255.255.0

no keepalive

clockrate 64000

!

interface Vlan89 type trbrf

no ip address

source-bridge trcrf-vlan 9 ring-group 100

source-bridge spanning

Figure 16 Configuration for DLSw+

The following is the configuration for a Catalyst 5000 with a Token Ring module in slot 5. In this configuration, the Token Ring port 5/1 is assigned with the TrCRF VLAN 10:

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Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.